Re: Need a calculator that knows about coulombs
On Monday 28 December 2015 04:30:06 Jörg-Volker Peetz wrote:
> Gene Heskett wrote on 12/23/15 16:12:
> > On Wednesday 23 December 2015 08:49:34 Jörg-Volker Peetz wrote:
> >> e.g., Qucs
> >> https://en.wikipedia.org/wiki/Quite_Universal_Circuit_Simulator
> >>
> >> Regards,
> >> jvp.
> >
> > Sounds like exactly what might be useful here. But no qucs exists in
> > the wheezy repos. Dowloaded src, will see if it will build on
> > wheezy.
>
> Could you get Qucs working?
Yes and no. I've drawn a schematic but cannot make it simulate it. Going
out to the workbench and building it with my limited junk box parts
assortment results in a working circuit, if you don't mind your coffee
being lukewarm by the time it fires. :( I have extracted some more
parts from scrap electronics, which may result in too fast a response,
some 0.01 uF caps for the pump cap, and a couple .22 uF's for the
storage cap, and 1n914 si diodes for test, but I have some schottky's,
an assortment of tantalum caps, a few hexfets & such coming from
aliexpress via China Post, but they'll be into 2016 by the time they get
here. And I haven't carved up a pcb to hold it all yet either. PCB I
have, but I'll have to carve isolation islands by hand and surface mount
the leaded parts. Thats time consuming when the mills spindle is 100x
too slow to spin an etching tool correctly. 2" per minute or less. I
have done it, using eagle for the drawing source, but the etching is
similar to watching paint dry. I will likely use a 1/16" carbide mill so
I don't have to retrace so many times to get an adequate separation of
the copper. The std v tip etch tool only cuts a thou deep and wide
unless you want to wear it out cutting the glass under the copper.
The qucs simulation is hampered by its lack of two part models, a decent
hexfet, and a total lack of anything that looks like a 40 Amp SSR. I
tried to make an enhancement mode hexfet from an n channel MOSFET, but
it wants the blanks filled in with info only the mask designer and
silicon foundry would know. In that regard, its obvious I don't know
what the heck I am doing, darn it.
> By the way, I just remember there's the Emacs builtin calculator
> "calc" which a.o. can handle expressions with units.
I've looked at units, and it could probably be scripted to do what I
want, but I'd need a better grasp of math to do it and get results out
of gnuplot by 1/31/16. :( I can capture it on a digital scope in 10
seconds once the soldering iron has pasted a test circuit together. :)
> Regards,
> jvp.
Cheers, Gene Heskett
--
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-Ed Howdershelt (Author)
Genes Web page <http://geneslinuxbox.net:6309/gene>
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